[mrwh]

Could you explain why your solutions are being blown off? Is it because you're at a top-down environment which doesn't listen to junior engineers as a matter of course? If that's the case, then it's an unusual situation to be in at a FAANG, and you should just move teams. Or are your solutions not appropriate for some reason, or are you not effective at championing them? No shame in this! It's where most of us begin. Selling other people on a good idea is itself a difficult skill, and a necessary one if you want to be promoted more than one more time. So: stay. And think about all the non-technical skills one must learn in any career.